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Vehicle license plate Chinese character recognition method based on multi-feature fusion

A multi-feature fusion and Chinese character recognition technology, applied in the field of image processing, can solve problems such as weak anti-interference ability and slow operation

Active Publication Date: 2015-04-29
ANHUI TSINGLINK INFORMATION TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

The advantage of this type of feature is the ability to distinguish characters; the disadvantage is that the anti-interference ability is weak and the operation is relatively slow

Method used

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  • Vehicle license plate Chinese character recognition method based on multi-feature fusion
  • Vehicle license plate Chinese character recognition method based on multi-feature fusion
  • Vehicle license plate Chinese character recognition method based on multi-feature fusion

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Embodiment Construction

[0051] Below, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0052] Such as figure 1 As shown, a license plate Chinese character recognition method based on multi-feature fusion includes the following steps:

[0053] Step 101: Obtain the training samples of the SVM classifier, collect the Chinese character fusion feature vectors of all the training samples according to the following steps 102 to 107, send them to the SVM classifier for training, and obtain the training result file.

[0054] Step 102, normalize the image to be tested to eliminate the influence of different sizes.

[0055] Step 103, such as figure 2 As shown, based on the HOG feature theory, the Chinese character edge feature vector of the image to be tested is obtained, and the specific steps are as follows:

[0056](1) According to formula [1] and formula [2], calculate the gradient magnitude M(x, y) and direction angle α(x, y) of e...

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Abstract

The invention provides a vehicle license plate Chinese character recognition method based on multi-feature fusion. The vehicle license plate Chinese character recognition method comprises the following steps: unifying images to be detected; improving HOG features to obtain Chinese character edge features of the to-be-detected images; obtaining Chinese character gray features of the to-be-detected images; obtaining Chinese character textural features of the images to be detected based on LBP feature theory; fusing the Chinese character edge features, the gray features and the textural features of the images to be detected to obtain fusion feature vectors of the to-be-detected images; forecasting a classification result based on an SVM classifier. The vehicle license plate Chinese character recognition method comprehensively uses global features and local features of the Chinese characters, can be used for identifying more accurately, and has high robustness on low-quality images and high-interference images.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method for recognizing Chinese characters on a license plate based on multi-feature fusion. Background technique [0002] License plate character recognition is the last step of the license plate recognition system, and it is also a crucial step, which directly affects the recognition accuracy and efficiency of the entire system. For the recognition of the alphanumeric part of the license plate, there are many mature methods at home and abroad, which can achieve a high accuracy rate. As for the Chinese character part of the license plate, due to the license plate image collected in the actual environment, the Chinese character part often has the characteristics of complex structure, many strokes, low resolution, broken strokes, partial shallow or missing, blurred edges, and inclined characters, which makes Chinese characters Recognition becomes very difficult, based o...

Claims

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Application Information

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IPC IPC(8): G06K9/62G08G1/017
CPCG08G1/017G06F18/2411
Inventor 张卡何佳聂勇郑浩
Owner ANHUI TSINGLINK INFORMATION TECH
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